examples-modeldata.qdoc
57 lines
| 2.8 KiB
| text/plain
|
TextLexer
Jani Honkonen
|
r919 | /*! | ||
| \example examples/modeldata | ||||
| \title Model data example | ||||
| \subtitle | ||||
| This example shows how to use QAbstractItemModel derived model as the data for the series. | ||||
Marek Rosa
|
r935 | |||
|
Marek Rosa
|
r1030 | \image examples_modeldata.png | ||
|
Marek Rosa
|
r935 | |||
| Let's start by creating an instance of CustomTableModel class. | ||||
| CustomTableModel class is derived from QAbstractTableModel and it was created for the purpose of this example. | ||||
| The constructor of this class populates the internal data store of the model with the data that is good for our chart example. | ||||
| \snippet ../examples/modeldata/tablewidget.cpp 1 | ||||
| We now have a model with data that we would like to display both on the chart and in a QTableView. | ||||
|
Marek Rosa
|
r1030 | First, we create QTableView and tell it use the model as a data source. To make the data cells fill the table view we also change headers resize mode. | ||
|
Marek Rosa
|
r935 | |||
| \snippet ../examples/modeldata/tablewidget.cpp 2 | ||||
| Now we need QChart instance to display the same data on the chart. | ||||
| We also enable animations. It makes it easier to see how modifying the model's data affect the chart. | ||||
| \snippet ../examples/modeldata/tablewidget.cpp 3 | ||||
|
Marek Rosa
|
r1405 | The code below creates new line series and gives it a name. Following line creates an instance of QVXYModelMapper class. | ||
|
Marek Rosa
|
r1358 | Next two lines specifie that x coordinates are taken from the model's column(Qt::Vertical) with index 0 and the y coordinates are taken from the model's column with index 1. | ||
| To create a connection between the series and the model we set both of those objects to QVXYModelMapper. | ||||
|
Marek Rosa
|
r935 | Finally the series is added to the chart. | ||
| \snippet ../examples/modeldata/tablewidget.cpp 4 | ||||
Mika Salmela
|
r2456 | To show in QTableView which data corresponds with which series this example uses table coloring. | ||
|
Marek Rosa
|
r1405 | When series is added to the chart it is assigned a color based on the currently selected theme. | ||
|
Marek Rosa
|
r935 | Code below extracts that color from the series and uses it to create colored QTableView. | ||
| Coloring of the view is not a part of the QChart functionality. | ||||
| \snippet ../examples/modeldata/tablewidget.cpp 5 | ||||
| The same operations are done with second series. Notice that for this series different columns of the same model are mapped. | ||||
| \snippet ../examples/modeldata/tablewidget.cpp 6 | ||||
| \snippet ../examples/modeldata/tablewidget.cpp 7 | ||||
| To avoid setting up the QGraphicsScene we use QChartView class that does it for us. QChart object pointer is used as a parameter of the QChartView constructor. | ||||
|
Marek Rosa
|
r1358 | To make the render look nicer Antialiasing is turned on and the minimum size of the chartView widget is set. | ||
|
Marek Rosa
|
r935 | |||
| \snippet ../examples/modeldata/tablewidget.cpp 8 | ||||
| Finally we place both widgets in a layout and use the layout as the application layout. | ||||
| \snippet ../examples/modeldata/tablewidget.cpp 9 | ||||
| Application is ready. Try modifying the data in the table view and see how it affects the chart. | ||||
|
Jani Honkonen
|
r919 | */ | ||